A 35kv bus box

Abstract

This utility model provides a 35kV combiner box, including a box body, an electrical interlocking mechanism symmetrically suspended and fixed to the upper part of the inner side of the box body, an insulator assembly suspended and fixed to the center of the upper part of the box body, and a surge arrester assembly installed in the middle of the lower end of the box body. Each electrical interlocking mechanism has an incoming / outgoing line disconnecting switch at its lower end. The front of the box body has a double-door structure, including a double-opening inner door and a double-opening outer door. The double-opening inner door consists of two metal door panels with viewing windows. The electrical interlocking mechanism is equipped with a mechanical interlocking plate. When any of the incoming / outgoing line disconnecting switches is closed, the mechanical interlocking plate pops out and inserts into the limiting slot at the upper end of the double-opening inner door. When any of the incoming / outgoing line disconnecting switches is opened, the mechanical interlocking plate retracts upward into the electrical interlocking mechanism. This utility model relates to the field of combiner box technology.

Description

Technical Field

[0001] This utility model relates to the field of combiner box technology, and in particular to a 35KV combiner box. Background Technology

[0002] In high-voltage grid-connected fields such as distributed photovoltaic and wind power, the 35kV combiner box is a key piece of equipment, and its safety and spatial layout are particularly important. Existing combiner boxes typically use side-mounted disconnect switches, resulting in an overall height of the equipment. In particular, the installation height of the 35kV cable head needs to be maintained at about 1000mm, which not only occupies a lot of space but also makes operation inconvenient. In addition, the inner door of existing designs mostly uses a mesh door structure, which cannot effectively block the arcing generated when the disconnect switch is opened and closed, posing a safety hazard to operators. More significantly, the existing technology lacks a reliable interlocking mechanism: there is no linkage device between the inner door and the disconnect switch for mechanical and electrical interlocking. The inner door can still be opened when the equipment is energized, which can easily lead to the risk of accidentally entering a live compartment. On the other hand, surge arresters are usually only installed on the incoming or outgoing side, which cannot provide comprehensive overvoltage and lightning strike protection for both incoming and outgoing circuits at the same time, resulting in insufficient protection of power grid equipment.

[0003] Therefore, the inventors urgently needed a 35KV combiner box to solve the above problems. Utility Model Content

[0004] In view of the above-mentioned defects in the prior art, this utility model provides a 35KV combiner box, which aims to solve the problems of large space occupation, poor operational safety, lack of reliable interlocking mechanism and incomplete lightning protection in the existing 35KV combiner box.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a 35KV combiner box, comprising an enclosure, an electrical interlocking mechanism symmetrically suspended and fixed to the upper part of the inner side of the enclosure, an insulator assembly suspended and fixed to the center of the upper part of the enclosure, and a surge arrester assembly installed in the middle of the lower end of the enclosure. Each electrical interlocking mechanism is provided with an incoming / outgoing line disconnecting switch at its lower end. The front of the enclosure is provided with a double-door structure, which includes a double-opening inner door and a double-opening outer door. The double-opening inner door consists of two metal door panels with viewing windows. The electrical interlocking mechanism is provided with a mechanical interlocking plate. When any of the incoming / outgoing line disconnecting switches is closed, the mechanical interlocking plate pops out and inserts into the limiting slot at the upper end of the double-opening inner door. When any of the incoming / outgoing line disconnecting switches is opened, the mechanical interlocking plate retracts upward into the electrical interlocking mechanism.

[0006] Based on the above, the beneficial effects of a new 35KV combiner box are that it solves the problems of large space occupation, poor operational safety, lack of reliable interlocking mechanism, and incomplete lightning protection in existing 35KV combiner boxes; mainly reflected in:

[0007] 1. This utility model achieves a vertical and compact layout of the internal space of the equipment by symmetrically hoisting and fixing the electrical interlocking mechanism to the upper part of the inner side of the box, fixing the insulator group to the center of the upper part of the inner side of the box, and installing the surge arrester group at the center of the lower end of the box. This hoisting structure effectively reduces the overall height of the equipment and optimizes the installation space of the 35KV cable head, making its height easier to control within a reasonable range, and significantly reducing the overall volume and floor space of the combiner box.

[0008] 2. This utility model combines safety protection for operators with visualization of the operating status by setting a double-door structure, including a double inner door and a double outer door, at the front of the enclosure. The double inner door consists of two metal door panels with viewing windows. The metal double inner door can effectively block the arcing generated when the isolating switch is opened and closed when closed, preventing injury to the operator. At the same time, the viewing windows allow the operator to directly observe the status of the equipment inside the enclosure without opening the inner door, improving the convenience and safety of operation.

[0009] 3. This utility model achieves a forced mechanical interlock between the state of the isolating switch and the opening and closing of the inner door by setting a mechanical interlocking plate on the electrical interlocking mechanism and a corresponding limit port on the upper end of the double inner door. When any incoming or outgoing line isolating switch is in the closed state (i.e., energized state), the mechanical interlocking plate automatically pops out and inserts into the limit port of the double inner door, physically locking the inner door and preventing it from being opened, thus fundamentally eliminating the risk of accidentally entering the energized compartment; only when all incoming and outgoing line isolating switches are open (i.e., de-energized state) will the mechanical interlocking plate retract and the inner door be opened, ensuring that operators can only perform internal maintenance operations after the equipment has been safely de-energized.

[0010] 4. This utility model achieves comprehensive overvoltage and lightning strike protection for incoming and outgoing circuits by centrally installing the surge arrester group at the lower middle of the enclosure and connecting it to the incoming and outgoing disconnect switches via the busbar. This central arrangement allows the surge arrester group to simultaneously and equally protect the incoming and outgoing circuits, overcoming the shortcomings of the prior art where surge arresters are only configured on one side, resulting in incomplete protection. This significantly improves the safety and reliability of power grid equipment under severe weather conditions.

[0011] Furthermore, a surge arrester connection bar is provided between the two incoming and outgoing disconnect switches, and the surge arrester connection bar is connected to the surge arrester group via a busbar. Each of the two incoming and outgoing disconnect switches has an incoming and outgoing connection bar at its far ends.

[0012] Based on the above, the beneficial effects of the surge arrester connection bar are that it connects two incoming and outgoing disconnect switches and connects the surge arrester group to the main circuit through the busbar, realizing bidirectional overvoltage protection for the incoming and outgoing circuits. Specifically, the surge arrester connection bar, as an electrical connection hub, enables the surge arrester group to simultaneously monitor and suppress surge voltages on both the incoming and outgoing sides, ensuring that in the event of lightning strikes or operational overvoltages, the current can be discharged to the ground through the shortest path, thereby comprehensively protecting the safe operation of the equipment inside the combiner box and the connected power grid. The beneficial effects of the two incoming and outgoing connection bars are that they are respectively set at the ends of the two incoming and outgoing disconnect switches, realizing a reliable electrical connection between the external cable and the main circuit inside the combiner box. Furthermore, the symmetrical layout of the incoming and outgoing connection bars optimizes the current distribution, reduces contact resistance, and improves the electrical performance and long-term operational stability of the system.

[0013] Furthermore, the viewing window is made of tempered glass.

[0014] Based on the above, the beneficial effect of tempered glass is that, through its high strength characteristics, it can withstand the arc impact and mechanical vibration that may be generated when the disconnector switch is opened and closed, thus avoiding safety hazards caused by accidental breakage.

[0015] Furthermore, the double outer door consists of two symmetrical metal door panels that completely cover the double inner door when closed.

[0016] Based on the above, the beneficial effects of the double-opening outer door are that it adopts a two-piece symmetrical metal door panel structure, which completely covers the double-opening inner door when closed, achieving double protection. Specifically, the metal door panel structure provides the first physical barrier for the cabinet, effectively resisting the corrosion of internal equipment by external environmental factors (such as rain, dust, and foreign object impact); at the same time, its design of completely covering the inner door avoids safety hazards caused by misoperation of the inner door, while retaining the maintenance convenience of independently opening the outer door.

[0017] Furthermore, the electrical interlocking mechanism is also provided with an on / off operation structure, which includes an outer operating panel and an inner drive component. The outer operating panel is located above the double inner door, and the inner drive component is located above the inlet / outlet disconnect switch. The outer operating panel and the inner drive component are connected. The fixed end of the mechanical interlock plate is connected to the inner drive component, and the limiting end of the mechanical interlock plate is located above the double inner door.

[0018] Based on the above, the beneficial effect of the on / off operation structure is that, through the linkage design of the external operating panel and the internal drive component, the safe opening and closing operation of the disconnecting switch and the access control interlock are synchronized. Specifically, the external operating panel is located above the double-opening inner door, allowing operators to perform the switching operation from a safe distance; the internal drive component is directly linked to the mechanical interlock plate, ensuring that the mechanical interlock plate automatically pops out and locks the inner door when the disconnecting switch is closed, forming a mandatory anti-misoperation interlock. This internal and external linkage structure design not only meets the safety isolation requirements of high-voltage equipment operation, but also achieves zero-delay status feedback through direct mechanical connection, fundamentally eliminating the risk of opening the door while it is energized.

[0019] Furthermore, a passive electromagnetic lock is installed between the two symmetrical metal door panels of the double-opening inner door. The passive electromagnetic lock is an independent mechanical lock that is unlocked by an electromagnetic key authorized by a key.

[0020] Based on the above, the beneficial effects of the passive electromagnetic lock are that it achieves dual security protection of hierarchical access control and mechanical interlocking. Specifically, this independent mechanical lock is driven to unlock by an electromagnetic key authorized by a key, ensuring that only authorized personnel can open the inner door to operate the equipment. At the same time, its passive nature allows the lock to remain locked even when the power is off, forming a complementary protection with the mechanical interlocking plate of the electrical locking mechanism. Together, they construct a multi-layered anti-misoperation system of electrical locking + mechanical locking, effectively solving the security risks of traditional junction boxes that rely on only a single locking method.

[0021] To more clearly illustrate the above-mentioned features of this utility model and the objectives it aims to achieve, the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0022] Figure 1 : This is a perspective view of the present invention;

[0023] Figure 2 :for Figure 1 An enlarged schematic diagram of part A;

[0024] Figure 3 : This is a perspective view of the present invention from another angle.

[0025] Explanation of reference numerals: 1-Enclosure, 11-Double inner door, 111-Viewing window, 112-Passive electromagnetic lock, 12-Double outer door, 2-Electrical interlocking mechanism, 21-Mechanical interlock plate, 22-On / off operation structure, 221-Outer operation panel, 222-Inner drive component, 3-Insulator group, 4-Surge arrester group, 5-Incoming / outgoing disconnect switch, 51-Surge arrester connection bar, 52-Incoming / outgoing connection bar. Detailed Implementation

[0026] like Figures 1-3 As shown, a 35KV combiner box includes a box body 1, an electrical interlocking mechanism 2 symmetrically suspended and fixed to the upper inner side of the box body 1, an insulator group 3 suspended and fixed to the center of the upper part of the box body 1, and a surge arrester group 4 installed in the middle of the lower end of the box body 1. Each electrical interlocking mechanism 2 is provided with an incoming / outgoing line disconnecting switch 5 at its lower end. The front of the box body 1 is provided with a double-door structure, which includes a double inner door 11 and a double outer door 12. The double inner door 11 consists of two metal door panels with viewing windows 111. The electrical interlocking mechanism 2 is provided with a mechanical interlocking plate 21. When any of the incoming / outgoing line disconnecting switches 5 is closed, the mechanical interlocking plate 21 pops out and inserts into the limiting slot at the upper end of the double inner door 11. When any of the incoming / outgoing line disconnecting switches 5 is opened, the mechanical interlocking plate 21 retracts upward into the electrical interlocking mechanism 2.

[0027] A surge arrester connection bar 51 is provided between the two incoming and outgoing line disconnect switches 5. The surge arrester connection bar 51 is connected to the surge arrester group 4 through a busbar. Each of the two incoming and outgoing line disconnect switches 5 is provided with an incoming and outgoing line connection bar 52 at the ends of the two incoming and outgoing line disconnect switches 5 that are far apart from each other.

[0028] The viewing window 111 is made of tempered glass.

[0029] The double outer door 12 consists of two symmetrical metal door panels that completely cover the double inner door 11 when closed.

[0030] The electrical interlocking mechanism 2 is also provided with an on / off operation structure 22, which includes an outer operation panel 221 and an inner drive component 222. The outer operation panel 221 is located above the double inner door 11, and the inner drive component 222 is located above the inlet / outlet disconnect switch 5. The outer operation panel 221 and the inner drive component 222 are connected. The fixed end of the mechanical interlock piece 21 is connected to the inner drive component 222, and the limiting end of the mechanical interlock piece 21 is located above the double inner door 11.

[0031] A passive electromagnetic lock 112 is provided between the two symmetrical metal door panels of the double inner door 11. The passive electromagnetic lock 112 is an independent mechanical lock that is unlocked by an electromagnetic key authorized by a key.

[0032] In summary, the specific embodiments of this utility model are as follows:

[0033] The interior of the enclosure 1 adopts a vertical layered layout. The electrical interlocking mechanism 2 is symmetrically fixed to the upper two sides of the inner side of the enclosure 1. The insulator group 3 is centrally installed in the upper center of the enclosure 1. The surge arrester group 4 is fixed in the lower middle of the enclosure 1. The incoming and outgoing disconnect switches 5 are respectively set at the lower end of the electrical interlocking mechanism 2. The two incoming and outgoing disconnect switches 5 are connected by a surge arrester connecting strip 51. The surge arrester connecting strip 51 is connected downward to the surge arrester group 4 via a busbar. The incoming and outgoing connecting strips 52 are respectively set at the far end between the two incoming and outgoing disconnect switches 5 for external cable connection.

[0034] In the double-door structure, the double inner door 11 is installed on the inner front of the box 1 via hinges. A passive electromagnetic lock 112 is installed at the joint of the two metal door panels. A limit opening is opened on the upper part of the door panel, and a tempered glass viewing window 111 is embedded in the middle. The double outer door 12 is installed on the outer front of the box 1 via external hinges. When closed, it completely covers the double inner door 11. The mechanical interlocking piece 21 of the electrical locking mechanism 2 is fixedly connected to the inner drive component 222, and the limit end is suspended above the double inner door 11. The external operation panel 221 of the on / off operation structure 22 is located above the double inner door 11 and is linked with the inner drive component 222 via a connecting rod.

[0035] When the operator performs the closing operation through the external operating panel 221, the internal drive component 222 drives the incoming and outgoing line isolating switch 5 to complete the closing, and at the same time drives the mechanical interlock plate 21 to pop out downward and insert into the limit slot at the upper end of the double inner door 11 to achieve physical locking. If the equipment is energized at this time, the passive electromagnetic lock 112 remains in the locked state, and the double inner door 11 cannot be opened.

[0036] When maintenance is required, the operator performs the tripping operation through the external control panel 221. The internal drive component 222 moves in the reverse direction to disconnect the incoming and outgoing line isolating switch 5. At the same time, the mechanical interlock plate 21 retracts upward into the electrical interlocking mechanism 2. After confirming that the equipment is powered off, the passive electromagnetic lock 112 is unlocked using the key-authorized electromagnetic key, and the double inner door 11 can be opened. During the operation, the internal equipment status can be observed in real time through the tempered glass viewing window 111. The double outer door 12 provides external maintenance space when open and forms a fully sealed protection when closed.

[0037] After maintenance is completed, the double inner door 11 is closed, and the passive electromagnetic lock 112 automatically locks; when the closing operation is resumed, the mechanical interlock plate 21 pops out again to lock the inner door, forming a forced interlocking closed loop between the electrical status and the access control.

[0038] The above description is only the optimal solution embodiment of this utility model and is not intended to limit this utility model. Various modifications or substitutions made by those skilled in the art to this utility model without departing from the essence and protection scope of this utility model should also be within the protection scope of this utility model.

Claims

1. A 35KV combiner box, characterized in that: The enclosure includes a housing (1), an electrical interlocking mechanism (2) symmetrically suspended and fixed to the upper inner side of the housing (1), an insulator group (3) suspended and fixed to the center of the upper part of the housing (1), and a surge arrester group (4) installed at the middle of the lower end of the housing (1). Each electrical interlocking mechanism (2) is equipped with an inlet / outlet disconnect switch (5) at its lower end. The front of the housing (1) is provided with a double-door structure, which includes a double inner door (11) and a double outer door (12). The double inner door (11) consists of two metal door panels with viewing windows (111). The electrical locking mechanism (2) is equipped with a mechanical interlocking piece (21). When any of the inlet / outlet disconnect switches (5) is closed, the mechanical interlocking piece (21) pops out and inserts into the limit opening at the upper end of the double inner door (11). When any of the inlet / outlet disconnect switches (5) is opened, the mechanical interlocking piece (21) retracts upward into the electrical locking mechanism (2).

2. A 35KV combiner box according to claim 1, characterized in that: A surge arrester connection bar (51) is provided between the two incoming and outgoing disconnect switches (5). The surge arrester connection bar (51) is connected to the surge arrester group (4) through a busbar. Each of the two incoming and outgoing disconnect switches (5) has an incoming and outgoing connection bar (52) at the ends that are far apart from each other.

3. A 35KV combiner box according to claim 1, characterized in that: The viewing window (111) is made of tempered glass.

4. A 35KV combiner box according to claim 1, characterized in that: The double outer door (12) consists of two symmetrical metal door panels that completely cover the double inner door (11) when closed.

5. A 35KV combiner box according to claim 1, characterized in that: The electrical interlocking mechanism (2) is also provided with an on / off operation structure (22), which includes an outer operation panel (221) and an inner drive component (222). The outer operation panel (221) is located above the double inner door (11), and the inner drive component (222) is located above the inlet / outlet disconnect switch (5). The outer operation panel (221) and the inner drive component (222) are connected. The fixed end of the mechanical interlock piece (21) is connected to the inner drive component (222), and the limiting end of the mechanical interlock piece (21) is located above the double inner door (11).

6. A 35KV combiner box according to claim 1, characterized in that: A passive electromagnetic lock (112) is provided between the two symmetrical metal door panels of the double inner door (11). The passive electromagnetic lock (112) is an independent mechanical lock that is unlocked by an electromagnetic key authorized by a key.

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